Updated model with 2 more mounting holes at the bottom for added stability.

Printed in PETG on pruta mini+.

May need supports under opening at bottom.

Modeled in Tinkercad.

Modeled after about 3 poop bags at max 135x60x55mm in size each.

Simply drag the bags out of the bottom when needed. When first roll is empty next one will fall to the bottom.